Recent $\mathbf{B}$ Physics Anomalies - a First Hint for Compositeness?

Abstract

We scrutinize the recently further strengthened hints for new physics in semileptonic $B$-meson decays, focusing on the 'clean' ratios of branching fractions $R_K$ and $R_{K^{\ast }}$ and examining to which pattern of new effects they point to. We explore in particular the hardly considered, yet fully viable, option of new physics in the right-handed electron sector and demonstrate how a recently proposed framework of leptons in composite Higgs setups naturally solves both the $R_K$ and $R_{K^{\ast }}$ anomalies via a peculiar structure of new physics effects, predicted by minimality of the model and the scale of neutrino masses. Finally, we also take into account further observables, such as $\mathcal{B}(B_s\to {\mu }^{+}{\mu }^{-})$, $\Delta M_{B_s}$, and angular observables in $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ decays, to arrive at a comprehensive picture of the model concerning (semileptonic) $B$ decays. We conclude that -- since it is in good agreement with the experimental situation in flavor physics and also allows to avoid ultra-light top partners -- the model furnishes a very promising scenarios of Higgs compositeness in the light of LHC data.

21 pages, 6 figures

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Cited by in corpus (15)

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• Unleashing the full power of LHCb to probe Stealth New Physics
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